No, they are not mounted. When writing to /mnt/web, you are writing to your root filesystem, not the new volume.
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EEAAApr 20 '13 at 15:21

ah, should I also add the root /dev/xvda1 to the fstab?
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edelwaterApr 20 '13 at 15:24

1

It is already in your fstab, likely mounted by its fs label, instead of by device node.
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EEAAApr 20 '13 at 15:30

Ah, then this is ::: LABEL=/ / ext4 defaults,noatime 1 1 (Im still curious how "LABEL=/" is found by the system and where it maps this to /dev/xvda1 but probably that should go in unix.stackexchange.com)
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edelwaterApr 20 '13 at 15:36